chemical engineering stoichiometry MCQs – Page 10

Practise multiple-choice questions from chemical engineering stoichiometry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering stoichiometry Mcqs
181. Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is__________________?
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A. Greater than 80.1C but less than 100C

B. 100C

C. 80.1C

D. Less than 80.1C

182. Which of the following ratios defines the recycle ratio in a chemical process ?
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A. Recycle stream/fresh feed stream

B. Gross feed stream/recycle feed stream

C. Recycle stream/gross feed stream

D. None of these

183. Which of the following is an exothermic reaction ?
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A. Dehydrogenation of ethane to ethylene

B. None of these

C. Decomposition of water

D. Conversion of graphite to diamond

184. Concentration of a solution expressed in terms of _______________ is independent of temperature?
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A. Molarity

B. None of these

C. Normality

D. Molality
185. Magnesite refractories are generally not used in the__________________?
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A. Burning zone of cement kilns

B. Electric furnace walls

C. Steel melting furnace

D. Open hearth furnace

186. Except for monatomic gases, the molal heat capacity at constant volume for all gases is _____________ Kcal/Kg mole. K?
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A. > 3

B. 3

C. < 1

D. < 3

187. A bypass stream in a chemical process is useful, because it___________________?
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A. Facilitates better control of the process

B. None of these

C. Increases the yield of products

D. Improves the conversion

188. With increase in the alumina content, the refractoriness of high alumina refractories_________________?
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A. Remain same

B. Increases

C. Decreases

D. May increase or decrease

189. The reaction A + B ? C has been conducted in a reactor as shown below. The number of boundaries around which material balance can be written, are_________________?
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A. 1

B. 6

C. 3

D. 4
190. 1 ata is equivalent to_________________?
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A. 1 atm

B. 10 torr

C. 1 kgf/cm2

D. 0.98 Pascal

191. Test piece for determination of RUL of a refractory is heated in a/an__________________?
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A. Oxidising atmosphere

B. Reducing atmosphere

C. Neutral atmosphere

D. Electric furnace
192. Number of gram equivalent of solute dissolved in one litre of solution is called its___________________?
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A. Molarity

B. Molality

C. Formality

D. Normally
193. Specific gravity on API scale is given by the relation (where, G = specific gravity at 15.5C) ?
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A. API = 145 (145/G)

B. API = (140/G) 130

C. API = (141.5/G) 131.5

D. API = 200(G 1)

194. If 1.5 moles of oxygen combines with aluminium to form Al2O3, then the weight of aluminium (atomic weight = 27) used in this reaction is __________ gm?
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A. 54

B. 2.7

C. 27

D. 5.4

195. Fireclay refractories___________________?
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A. ible aluminates silicates etc

B. All A., B. and C.

C. Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming

D. Shrink during firing

E. Are not resistant to the action of basic slags

196. Validity of the relationship, inputs = outputs, holds good for the system at steady state________________?
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A. None of these

B. With chemical reaction

C. Without chemical reaction & losses

D. Without chemical reaction

197. Refluxing of part of the distillate in a fractionating column is a recycling operation, aimed primarily at_______________?
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A. Yield enhancement

B. Heat conservation

C. Product enrichment

D. None of these

198. With rise in temperature, the solubility of ammonia in water at a fixed pressure__________________?
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A. Decreases

B. Remains unchanged

C. Increases

D. Increases exponentially

199. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is_________________?
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A. 1

B. 0.5

C. 0.05

D. 2

200. N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample? (Molecular weight of urea = 60) ?
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A. 95%

B. 98%

C. 90%

D. 80%